US20190386531A1 - Rotor with Surface Mounted Magnets - Google Patents
Rotor with Surface Mounted Magnets Download PDFInfo
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- US20190386531A1 US20190386531A1 US16/008,742 US201816008742A US2019386531A1 US 20190386531 A1 US20190386531 A1 US 20190386531A1 US 201816008742 A US201816008742 A US 201816008742A US 2019386531 A1 US2019386531 A1 US 2019386531A1
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- rotor
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- magnet
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K1/00—Details of the magnetic circuit
- H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
- H02K1/22—Rotating parts of the magnetic circuit
- H02K1/27—Rotor cores with permanent magnets
- H02K1/2706—Inner rotors
- H02K1/272—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis
- H02K1/274—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis the rotor consisting of two or more circumferentially positioned magnets
- H02K1/2753—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis the rotor consisting of two or more circumferentially positioned magnets the rotor consisting of magnets or groups of magnets arranged with alternating polarity
- H02K1/278—Surface mounted magnets; Inset magnets
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K1/00—Details of the magnetic circuit
- H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
- H02K1/22—Rotating parts of the magnetic circuit
- H02K1/28—Means for mounting or fastening rotating magnetic parts on to, or to, the rotor structures
- H02K1/30—Means for mounting or fastening rotating magnetic parts on to, or to, the rotor structures using intermediate parts, e.g. spiders
Definitions
- the present disclosure relates to electrical machines using permanent magnets such as surface mounted permanent magnet synchronous motors (PMSM) and, more particularly, to securement of magnets on PMSM rotors and methods of assembly thereof.
- PMSM surface mounted permanent magnet synchronous motors
- a permanent magnet is a component or a plurality of separate components manufactured from a magnetically hard material and is able to retain its magnetism permanently after magnetization.
- Permanent magnets are manufactured, for example, from an AlNiCo mixture that includes aluminum, nickel, cobalt and steel, or from ceramic materials or rare earth metals.
- the permanent magnets are positioned on the surface of the rotor facing an air gap defined between the rotor and stator parts of the machine.
- the rotor includes a magnetic core which is most often made of ferromagnetic iron sheets assembled into a sheet core extending throughout the rotor's length. While the permanent magnets are attracted to the steel core of the rotor, the centrifugal force created by the rotation of the rotor tends to pull the magnets off of the rotor.
- the mechanical structure and the fastening of the magnets are affected by factors such as the forces imposed on them during operation, which includes the size and operating speed of the electrical machine and exposure to heat.
- a characteristic method of attaching permanent magnets to the rotor surface facing the air gap is to adhesively bond the permanent magnets to the rotor surface and optionally install a supporting binding made of, for example, carbon-fiber reinforced plastic around the rotor.
- the assembly of such surface mounted permanent magnet rotors involves a certain cost and complexity. While gluing is a good option for some machines in medium speed machines, higher speed machines typically use banding due to the higher stresses involved. Such banding can make the machine expensive and also increases the machine air gap. It is especially important to ensure a secure connection between magnet and rotor in medium and high speed surface mounted rotors with ceramic magnets. For at least these reasons, securement of magnets on a rotor is a consideration of rotor design.
- One aspect of the disclosure is a rotor for a permanent magnet motor, including a rotor body having a cylindrical surface having a circumference.
- a plurality of magnets are disposed on the cylindrical surface at spaced intervals at the circumference, each of the magnets having a base disposed on the cylindrical surface and a top oriented radially away from the base, a sloping front side and a sloping rear side defining with the base and top an isosceles trapezoid shape in a cross sectional plane normal to an axis of rotation of the rotor, the isosceles trapezoid shape being broader at the base.
- a plurality of magnet retainers, each magnet retainer disposed between a neighboring pair of the plurality of magnets include angled faces that engage respective front and rear sides of adjacent pairs of the plurality of magnets.
- FIG. 1 is a partial side view of a rotor and stator of a permanent magnet synchronous machine according to an embodiment of the disclosure.
- FIG. 2 is a close up side view of a representation of an interconnection between a rotor and a magnet.
- FIG. 3 is a close up side view of a further interconnection between a rotor and magnet.
- FIG. 4 is an alternative embodiment of a rotor and magnet assembly.
- FIG. 5 is partial perspective view of a guide lamination.
- FIG. 6 is partial perspective view of a retention lamination.
- FIG. 7 is another alternative embodiment of a rotor and magnet assembly.
- FIG. 1 illustrates a partial illustration of an exemplary embodiment of a permanent magnet synchronous machine 8 where the rotor 10 is disposed inside a stator 12 (the inner circumference of the stator is marked with the dashed line).
- the stator is manufactured and configured in a conventional manner as well as components of the machine 8 with the following improved features.
- the rotor 10 includes a magnetic frame or rotor body 14 that, in one embodiment, is formed from magnetically conductive laminations, for example, by arranging a plurality of sheets as a sheet pack forming the length of the rotor in a well-known manner. Other non-laminated rotor configurations are contemplated.
- the rotor's magnetic frame is fastened, directly or via the rotor center 24 , onto the synchronous machine's shaft (not shown) in a well-known manner.
- a number of permanent magnets 16 are positioned on the outer circumference 18 of the magnetic frame of the rotor 10 .
- Each permanent magnet 16 includes an undersurface 20 , which is configured to fit on the outer surface 18 of the rotor's magnetic frame 14 .
- the undersurface 20 may have any appropriate shape, including a flat shape.
- the undersurface 20 is shown to be slightly curved, i.e., concave, corresponding to the curvature of the outer circumference 18 of the rotors magnetic frame.
- the concave undersurface 20 eliminates the need for washers or other means of adapting the fit of the magnets to the rotor 10 .
- the permanent magnet 16 may consist of two or more separate pieces.
- the permanent magnet 16 consists of three separate pieces 116 A, 116 B, 116 C ( FIG. 4 ) that are placed adjacent to each other and jointly comprise a single permanent-magnet pole.
- the permanent magnet pieces 16 of a single pole are formed so that the N-pole (North) of each piece faces the rotor body 14 and the S-pole (South) faces the air gap 26 and the stator 12 as illustrated, or correspondingly, the S-pole faces the rotor body and the N-pole faces the air gap 26 and the stator 12 .
- the adjacent permanent-magnet pieces within a pole may be glued together at their lateral surfaces using a suitable adhesive.
- the surface mounted magnets 16 are shaped so that there is an acute angle “A” at each corner of the base 28 of each magnet as shown in FIGS. 1-3 .
- acute means an angle of less than 90°.
- the angle A has the effect that each magnet 16 is wider at the base 28 at the bottom surface 20 than at the outer or top 30 .
- the angle A is created by the first, front, or leading side 32 of each 16 magnet becoming closer to the second, rear, or trailing side 34 as the sides 32 , 34 slope inwardly in the direction from the bottom 28 towards the top 30 to create two angled faces on the sides of each magnet 16 .
- each of the sides 32 , 34 is planar the entire distance from bottom 28 to top 30 , but the sides 32 and 34 can also have a non-planar shape such as a convex or concave shape that is made from a single curved surface or a series of flat surfaces disposed at angles relative to one another.
- the profile of the sides 32 and 34 can be semicircular, triangular, semi-hexagonal and the like.
- the described configuration of each of the magnets 16 may be referred to as having a “dovetail” shape, which includes any type of planar or non-planar side profile of the sides 32 and 34 .
- FIG. 2 illustrates the configuration of a magnet 16 wherein the “before,” orientation (before installation) is shown as an outline and the “after” orientation of the magnet (after installation) is shown in solid.
- the magnet 16 includes a top 30 , a bottom 28 and sides 32 , 34 defining a dovetail or isosceles trapezoid shape in cross section.
- the trapezoid shape includes acute angles A.
- the rotor body 14 also includes magnet retention features, which in FIG. 2 are as structures with sloping walls 42 that are formed at an angle that creates a parallel or nearly parallel relationship with sides 32 , 34 .
- the fit of the magnet 16 to the sloping walls 42 may define a gap 44 at each end of the magnet that is subsequently filled with a suitable adhesive or resin that functions to secure the magnet in position and prevents the magnet from being ejected from the rotor body 14 .
- a suitable adhesive or resin that functions to secure the magnet in position and prevents the magnet from being ejected from the rotor body 14 .
- the walls 42 and sides 32 , 34 may be configured with a cooperatively matching geometry as in FIG. 2 , so as to provide the gap 44 with a constant, rectangular cross-section. Accordingly, then the rotor 10 is rotated the magnets 16 load the adhesive in the gap 44 evenly across the entire joint, which spreads the stresses on the adhesive evenly, may permit higher operating speeds.
- the height D 2 of the walls 42 may be less than or equal to the height D 1 of the magnet 16 .
- the spacing between the walls 42 may be specified so as to permit the magnet 16 may be tipped as shown in the “before” orientation and dropped radially into the socket 46 defined by the walls and the outer surface of the rotor body 14 .
- the magnets 16 may be cooled to shrink the dimensional size thereof or the rotor 10 may be heated or both.
- the magnet 16 may be installed axially into the socket. Either of these methods may be performed by a robotic device in an automated process.
- FIGS. 1, 3, and 5 illustrate embodiments of a rotor body 14 including magnet retainers 40 including radially extending fingers 48 .
- the fingers 48 function to position and retain the magnets 16 on the rotor 10 .
- the fingers 48 include walls 42 that are angled such that the distal ends, the ends radially spaced apart from the rotor 10 , of the fingers are wider than the proximal ends, which proximal ends are located at the point of attachment of the fingers to the rotor body 14 .
- the relationship of the magnet sides 32 , 34 to the walls 42 creates a space 50 that is filled with adhesive or resin to fix the magnets in position, a technique referred to as “potting.”
- the radial length D 2 of each finger 48 may be about equal to or less than the radial height D 1 of magnets 16 .
- the rotor back iron 14 is either solid (one-piece construction) or made of a plurality of laminations and can be designed with the fingers 48 as shown in FIG. 3 .
- Other constructions of a rotor are also contemplated, for example, fingers of different radial heights and shapes.
- the radial height D 2 of each finger 48 may be less than half of the height D 1 of the magnet 16 , which reduces the leakage flux in the magnet.
- taller fingers 48 will also be effective in securing the magnets.
- the fingers 48 may be smooth-sided or may include a non-smooth texture, such as ribs, to provide grip to the magnets and adhesive.
- the fingers 48 may be formed integrally as part of the rotor body as in FIGS. 1 and 3 . Additional features could also be added to the magnets such as dimples, a rough texture, ribs, slots, knurling and the like to strengthen the adhesive bond between the magnets 16 and the fingers 48 and/or the rotor back iron or body 14 .
- the rotor body 14 may be formed of laminations shown in FIG. 4 .
- a pair of retention laminations 115 with fingers 148 formed thereon is interleaved with a guide lamination 117 with a guide stub 119 formed thereon.
- the magnets 116 are generally rectangular, with a layer of adhesive 128 affixing them to the rotor body 114 .
- the layer of adhesive 128 may conform to the outer curvature of the rotor body 114 .
- the magnets 116 further include tops 130 that include bevels 121 formed at the junction of the top and sides 132 , 134 .
- the bevels 121 permit the fingers 148 to interact with and retain the magnets 116 in position on the rotor body 114 .
- Guide stubs 119 of guide laminations 117 are rectangular tab shapes that may extend a lesser radial distance relative to the fingers 148 of the retention laminations 115 , as shown in FIG. 6 .
- the fingers 148 each have a flared portion 123 formed at a radially distal end thereof formed on the free end 125 of each finger.
- the flared portion 123 contacts bevels 121 of adjacent magnets 116 to retain the magnets in position.
- each rotor body 114 includes a lamination set 127 including one pair of retention laminations 115 with a guide lamination 117 sandwiched therebetween.
- a rotor body 114 may include one, two, three or more lamination sets 127 .
- FIG. 4 depicts a rotor body 114 with three lamination sets 127 .
- FIG. 7 shows an alternative rotor 210 and rotor body 214 .
- the rotor body includes a plurality of spaced dovetail slots 230 , each of which is sized and shaped to receive a correspondingly shaped and sized finger 248 .
- the dovetail slots 230 hold the fingers 248 on the rotor body 214 in a spaced configuration that is sized to receive magnets 16 , wherein the magnets include the configuration described above in connection with FIG. 1-3 .
- the fingers 248 therefore include a dovetail shape that engages and is held by the dovetail slots 230 , narrowing as the slot narrows toward the outer circumferential surface 18 of the rotor body 214 and again widening as the finger extends radially outwardly.
- the fingers 248 may be extruded in the illustrated cross-sectional shape and may be inserted into a corresponding slot 230 axially. Then, the magnets 16 may be either inserted axially into the spaces defined between adjacent fingers 248 or dropped in as shown in FIG. 2 .
- fast-setting adhesive may be used to perform the initial securement of magnets in position when unmagnetized magnets are used. If magnetized magnets are used, the magnets are held in position by the interaction with the fingers and the magnetic attraction between the magnet and rotor, and therefore do not require any other means of holding the assembly together. After fixing the magnets in position with or without adhesive, an adhesive can be applied between the fingers and the magnets thus securing the magnets in position to pot the assembly if desired.
- the illustrated configuration of magnets and finger-shaped magnet retention features are suitable for many kinds of surface mounted magnet devices, such as arc, bread-load modified arc, and so on.
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- Permanent Field Magnets Of Synchronous Machinery (AREA)
Abstract
Description
- The present disclosure relates to electrical machines using permanent magnets such as surface mounted permanent magnet synchronous motors (PMSM) and, more particularly, to securement of magnets on PMSM rotors and methods of assembly thereof.
- In a permanent magnet synchronous machine, a magnetic field is generated using permanent magnets installed on or around a rotor of the machine. A permanent magnet is a component or a plurality of separate components manufactured from a magnetically hard material and is able to retain its magnetism permanently after magnetization. Permanent magnets are manufactured, for example, from an AlNiCo mixture that includes aluminum, nickel, cobalt and steel, or from ceramic materials or rare earth metals.
- The permanent magnets are positioned on the surface of the rotor facing an air gap defined between the rotor and stator parts of the machine. The rotor includes a magnetic core which is most often made of ferromagnetic iron sheets assembled into a sheet core extending throughout the rotor's length. While the permanent magnets are attracted to the steel core of the rotor, the centrifugal force created by the rotation of the rotor tends to pull the magnets off of the rotor. The mechanical structure and the fastening of the magnets are affected by factors such as the forces imposed on them during operation, which includes the size and operating speed of the electrical machine and exposure to heat.
- A characteristic method of attaching permanent magnets to the rotor surface facing the air gap is to adhesively bond the permanent magnets to the rotor surface and optionally install a supporting binding made of, for example, carbon-fiber reinforced plastic around the rotor. The assembly of such surface mounted permanent magnet rotors involves a certain cost and complexity. While gluing is a good option for some machines in medium speed machines, higher speed machines typically use banding due to the higher stresses involved. Such banding can make the machine expensive and also increases the machine air gap. It is especially important to ensure a secure connection between magnet and rotor in medium and high speed surface mounted rotors with ceramic magnets. For at least these reasons, securement of magnets on a rotor is a consideration of rotor design.
- One aspect of the disclosure is a rotor for a permanent magnet motor, including a rotor body having a cylindrical surface having a circumference. A plurality of magnets are disposed on the cylindrical surface at spaced intervals at the circumference, each of the magnets having a base disposed on the cylindrical surface and a top oriented radially away from the base, a sloping front side and a sloping rear side defining with the base and top an isosceles trapezoid shape in a cross sectional plane normal to an axis of rotation of the rotor, the isosceles trapezoid shape being broader at the base. A plurality of magnet retainers, each magnet retainer disposed between a neighboring pair of the plurality of magnets, include angled faces that engage respective front and rear sides of adjacent pairs of the plurality of magnets.
- Further and alternative aspects and features of the disclosed principles will be appreciated from the following detailed description and the accompanying drawings. As will be appreciated, the principles related to load carrying members for work machines disclosed herein are capable of being carried out in other and different embodiments, and capable of being modified in various respects. Accordingly, it is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and do not restrict the scope of the appended claims.
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FIG. 1 is a partial side view of a rotor and stator of a permanent magnet synchronous machine according to an embodiment of the disclosure. -
FIG. 2 is a close up side view of a representation of an interconnection between a rotor and a magnet. -
FIG. 3 is a close up side view of a further interconnection between a rotor and magnet. -
FIG. 4 is an alternative embodiment of a rotor and magnet assembly. -
FIG. 5 is partial perspective view of a guide lamination. -
FIG. 6 is partial perspective view of a retention lamination. -
FIG. 7 is another alternative embodiment of a rotor and magnet assembly. - Reference will now be made in detail to specific embodiments or features, examples of which are illustrated in the accompanying drawings. Wherever possible, corresponding or similar reference numbers will be used throughout the drawings to refer to the same or corresponding parts. Moreover, references to various elements described herein, are made collectively or individually when there may be more than one element of the same type. However, such references are merely exemplary in nature. It may be noted that any reference to elements in the singular may also be construed to relate to the plural and vice-versa without limiting the scope of the disclosure to the exact number or type of such elements unless set forth explicitly in the appended claims.
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FIG. 1 illustrates a partial illustration of an exemplary embodiment of a permanent magnetsynchronous machine 8 where therotor 10 is disposed inside a stator 12 (the inner circumference of the stator is marked with the dashed line). The stator is manufactured and configured in a conventional manner as well as components of themachine 8 with the following improved features. - The
rotor 10 includes a magnetic frame orrotor body 14 that, in one embodiment, is formed from magnetically conductive laminations, for example, by arranging a plurality of sheets as a sheet pack forming the length of the rotor in a well-known manner. Other non-laminated rotor configurations are contemplated. The rotor's magnetic frame is fastened, directly or via therotor center 24, onto the synchronous machine's shaft (not shown) in a well-known manner. - According to the synchronous machine's number of poles, a number of
permanent magnets 16 are positioned on theouter circumference 18 of the magnetic frame of therotor 10. In the lengthwise (axial) direction of the synchronous machine, there are several separatepermanent magnets 16 substantially covering the length of the entire rotor (e.g.,FIG. 4 ). Eachpermanent magnet 16 includes anundersurface 20, which is configured to fit on theouter surface 18 of the rotor'smagnetic frame 14. Depending on the manufacturing method used to shape themagnets 16, and also the shape and construction of therotor 10, theundersurface 20 may have any appropriate shape, including a flat shape. In the illustrated embodiment, theundersurface 20 is shown to be slightly curved, i.e., concave, corresponding to the curvature of theouter circumference 18 of the rotors magnetic frame. When installed around therotor 10 shown inFIG. 4 , theconcave undersurface 20 eliminates the need for washers or other means of adapting the fit of the magnets to therotor 10. - The
permanent magnet 16 may consist of two or more separate pieces. In one embodiment, thepermanent magnet 16 consists of threeseparate pieces FIG. 4 ) that are placed adjacent to each other and jointly comprise a single permanent-magnet pole. Thepermanent magnet pieces 16 of a single pole are formed so that the N-pole (North) of each piece faces therotor body 14 and the S-pole (South) faces theair gap 26 and thestator 12 as illustrated, or correspondingly, the S-pole faces the rotor body and the N-pole faces theair gap 26 and thestator 12. The adjacent permanent-magnet pieces within a pole may be glued together at their lateral surfaces using a suitable adhesive. - In addition to the optional
concave undersurface 20, the surface mountedmagnets 16 are shaped so that there is an acute angle “A” at each corner of thebase 28 of each magnet as shown inFIGS. 1-3 . For purposes of the present disclosure, acute means an angle of less than 90°. The angle A has the effect that eachmagnet 16 is wider at thebase 28 at thebottom surface 20 than at the outer or top 30. The angle A is created by the first, front, or leadingside 32 of each 16 magnet becoming closer to the second, rear, ortrailing side 34 as thesides bottom 28 towards thetop 30 to create two angled faces on the sides of eachmagnet 16. Furthermore, in one embodiment, each of thesides bottom 28 totop 30, but thesides sides magnets 16 may be referred to as having a “dovetail” shape, which includes any type of planar or non-planar side profile of thesides -
FIG. 2 illustrates the configuration of amagnet 16 wherein the “before,” orientation (before installation) is shown as an outline and the “after” orientation of the magnet (after installation) is shown in solid. Themagnet 16 includes atop 30, abottom 28 andsides - The
rotor body 14 also includes magnet retention features, which inFIG. 2 are as structures withsloping walls 42 that are formed at an angle that creates a parallel or nearly parallel relationship withsides magnet 16 to the slopingwalls 42 may define agap 44 at each end of the magnet that is subsequently filled with a suitable adhesive or resin that functions to secure the magnet in position and prevents the magnet from being ejected from therotor body 14. It should be understood that when themagnet 16 is glued and potted into position on therotor body 14, the effect of rotating therotor 10 creates an outward force on the magnets and loads the adhesive in thegap 44. The shape of themagnet 16 and the fit of the magnet to thewalls 42 mechanically holds the magnet on therotor body 14. - The
walls 42 andsides FIG. 2 , so as to provide thegap 44 with a constant, rectangular cross-section. Accordingly, then therotor 10 is rotated themagnets 16 load the adhesive in thegap 44 evenly across the entire joint, which spreads the stresses on the adhesive evenly, may permit higher operating speeds. - The height D2 of the
walls 42 may be less than or equal to the height D1 of themagnet 16. The spacing between thewalls 42 may be specified so as to permit themagnet 16 may be tipped as shown in the “before” orientation and dropped radially into thesocket 46 defined by the walls and the outer surface of therotor body 14. To aid the “drop in” process, themagnets 16 may be cooled to shrink the dimensional size thereof or therotor 10 may be heated or both. Alternatively, themagnet 16 may be installed axially into the socket. Either of these methods may be performed by a robotic device in an automated process. -
FIGS. 1, 3, and 5 illustrate embodiments of arotor body 14 includingmagnet retainers 40 including radially extendingfingers 48. Thefingers 48 function to position and retain themagnets 16 on therotor 10. - The
fingers 48 includewalls 42 that are angled such that the distal ends, the ends radially spaced apart from therotor 10, of the fingers are wider than the proximal ends, which proximal ends are located at the point of attachment of the fingers to therotor body 14. The relationship of the magnet sides 32, 34 to thewalls 42 creates aspace 50 that is filled with adhesive or resin to fix the magnets in position, a technique referred to as “potting.” The radial length D2 of eachfinger 48 may be about equal to or less than the radial height D1 ofmagnets 16. - The rotor back
iron 14 is either solid (one-piece construction) or made of a plurality of laminations and can be designed with thefingers 48 as shown inFIG. 3 . Other constructions of a rotor are also contemplated, for example, fingers of different radial heights and shapes. The radial height D2 of eachfinger 48, may be less than half of the height D1 of themagnet 16, which reduces the leakage flux in the magnet. However,taller fingers 48 will also be effective in securing the magnets. Thefingers 48 may be smooth-sided or may include a non-smooth texture, such as ribs, to provide grip to the magnets and adhesive. In an embodiment where therotor body 14 is formed of a solid, unitary, one-piece construction, thefingers 48 may be formed integrally as part of the rotor body as inFIGS. 1 and 3 . Additional features could also be added to the magnets such as dimples, a rough texture, ribs, slots, knurling and the like to strengthen the adhesive bond between themagnets 16 and thefingers 48 and/or the rotor back iron orbody 14. - In some electrical machine devices it is not desirable to configure the shape of the magnets as dovetails and the
rotor body 14 may be formed of laminations shown inFIG. 4 . In one embodiment, with alaminated rotor body 114, a pair ofretention laminations 115 withfingers 148 formed thereon is interleaved with aguide lamination 117 with aguide stub 119 formed thereon. Themagnets 116 are generally rectangular, with a layer of adhesive 128 affixing them to therotor body 114. The layer of adhesive 128 may conform to the outer curvature of therotor body 114. Themagnets 116 further includetops 130 that includebevels 121 formed at the junction of the top andsides bevels 121 permit thefingers 148 to interact with and retain themagnets 116 in position on therotor body 114. -
Guide stubs 119 ofguide laminations 117, as shown inFIG. 5 , are rectangular tab shapes that may extend a lesser radial distance relative to thefingers 148 of theretention laminations 115, as shown inFIG. 6 . Thefingers 148 each have a flaredportion 123 formed at a radially distal end thereof formed on thefree end 125 of each finger. The flaredportion 123 contacts bevels 121 ofadjacent magnets 116 to retain the magnets in position. - In terms of arrangement, each
rotor body 114 includes alamination set 127 including one pair ofretention laminations 115 with aguide lamination 117 sandwiched therebetween. In an embodiment, arotor body 114 may include one, two, three or more lamination sets 127.FIG. 4 depicts arotor body 114 with three lamination sets 127. -
FIG. 7 shows analternative rotor 210 androtor body 214. The rotor body includes a plurality of spaceddovetail slots 230, each of which is sized and shaped to receive a correspondingly shaped andsized finger 248. Thedovetail slots 230 hold thefingers 248 on therotor body 214 in a spaced configuration that is sized to receivemagnets 16, wherein the magnets include the configuration described above in connection withFIG. 1-3 . Thefingers 248, therefore include a dovetail shape that engages and is held by thedovetail slots 230, narrowing as the slot narrows toward the outercircumferential surface 18 of therotor body 214 and again widening as the finger extends radially outwardly. In the present embodiment, thefingers 248 may be extruded in the illustrated cross-sectional shape and may be inserted into acorresponding slot 230 axially. Then, themagnets 16 may be either inserted axially into the spaces defined betweenadjacent fingers 248 or dropped in as shown inFIG. 2 . - When assembling a rotor as described above, fast-setting adhesive may be used to perform the initial securement of magnets in position when unmagnetized magnets are used. If magnetized magnets are used, the magnets are held in position by the interaction with the fingers and the magnetic attraction between the magnet and rotor, and therefore do not require any other means of holding the assembly together. After fixing the magnets in position with or without adhesive, an adhesive can be applied between the fingers and the magnets thus securing the magnets in position to pot the assembly if desired. The illustrated configuration of magnets and finger-shaped magnet retention features are suitable for many kinds of surface mounted magnet devices, such as arc, bread-load modified arc, and so on.
- Various embodiments disclosed herein are to be taken in the illustrative and explanatory sense, and should in no way be construed as limiting of the present disclosure.
- While aspects of the present disclosure have been particularly shown and described with reference to the embodiments above, it will be understood by those skilled in the art that various additional embodiments may be contemplated by the modification of the disclosed machines, systems and methods without departing from the spirit and scope of what is disclosed. Such embodiments should be understood to fall within the scope of the present disclosure as determined based upon the claims and any equivalents thereof.
Claims (20)
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US16/008,742 US11515745B2 (en) | 2018-06-14 | 2018-06-14 | Rotor with surface mounted magnets |
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US16/008,742 US11515745B2 (en) | 2018-06-14 | 2018-06-14 | Rotor with surface mounted magnets |
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Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
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WO2022045985A1 (en) * | 2020-08-31 | 2022-03-03 | Domel d.o.o. | Rotor with permanent magnets as part of electronically commutated electric motor |
US20220103036A1 (en) * | 2020-09-29 | 2022-03-31 | Nichia Corporation | Yoke for rotor of axial gap motor |
US20220149683A1 (en) * | 2020-10-30 | 2022-05-12 | Seiko Epson Corporation | Rotary motor and manufacturing method for rotor |
US20230006491A1 (en) * | 2021-07-05 | 2023-01-05 | ZF Automotive UK Limited | Surface permanent magnet motor |
WO2023135730A1 (en) * | 2022-01-14 | 2023-07-20 | 三菱電機株式会社 | Rotating electric machine |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4942324A (en) * | 1988-05-30 | 1990-07-17 | Mitsubishi Denki Kabushiki Kaisha | Rotor for rotary electric machine |
US20050184611A1 (en) * | 2003-08-26 | 2005-08-25 | Deere & Co. | Permanent magnet motor |
US20070024141A1 (en) * | 2005-07-29 | 2007-02-01 | Thomas Drexlmaier | Permanent Magnet Rotor for a Brushless Electrical Machine |
US20070103023A1 (en) * | 2005-11-04 | 2007-05-10 | Canopy Tecnologies, Llc | Method of compressing lamination stacks for permanent magnet rotor |
US7701100B2 (en) * | 2004-06-02 | 2010-04-20 | Etel S.A. | Synchronous motor |
US8310126B1 (en) * | 2011-10-27 | 2012-11-13 | Motor Patent Licensors, LLC | Radial flux permanent magnet AC motor/generator |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH05161287A (en) * | 1991-11-29 | 1993-06-25 | Fanuc Ltd | Rotor of synchronous apparatus |
US10742082B2 (en) * | 2014-12-31 | 2020-08-11 | Ingersoll-Rand Industrial U.S., Inc. | Fixation system for a permanent magnet rotor |
-
2018
- 2018-06-14 US US16/008,742 patent/US11515745B2/en active Active
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4942324A (en) * | 1988-05-30 | 1990-07-17 | Mitsubishi Denki Kabushiki Kaisha | Rotor for rotary electric machine |
US20050184611A1 (en) * | 2003-08-26 | 2005-08-25 | Deere & Co. | Permanent magnet motor |
US7701100B2 (en) * | 2004-06-02 | 2010-04-20 | Etel S.A. | Synchronous motor |
US20070024141A1 (en) * | 2005-07-29 | 2007-02-01 | Thomas Drexlmaier | Permanent Magnet Rotor for a Brushless Electrical Machine |
US20070103023A1 (en) * | 2005-11-04 | 2007-05-10 | Canopy Tecnologies, Llc | Method of compressing lamination stacks for permanent magnet rotor |
US8310126B1 (en) * | 2011-10-27 | 2012-11-13 | Motor Patent Licensors, LLC | Radial flux permanent magnet AC motor/generator |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2022045985A1 (en) * | 2020-08-31 | 2022-03-03 | Domel d.o.o. | Rotor with permanent magnets as part of electronically commutated electric motor |
US20220103036A1 (en) * | 2020-09-29 | 2022-03-31 | Nichia Corporation | Yoke for rotor of axial gap motor |
US20220149683A1 (en) * | 2020-10-30 | 2022-05-12 | Seiko Epson Corporation | Rotary motor and manufacturing method for rotor |
US20230006491A1 (en) * | 2021-07-05 | 2023-01-05 | ZF Automotive UK Limited | Surface permanent magnet motor |
GB2620355A (en) * | 2021-07-05 | 2024-01-10 | Zf Automotive Uk Ltd | A surface permanent magnet motor |
WO2023135730A1 (en) * | 2022-01-14 | 2023-07-20 | 三菱電機株式会社 | Rotating electric machine |
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